Principia, bk. iii. Prop. 37, Corollaries, 2 and 3. Motte’s translation, vol. ii. p. 310.

Roscoe’s Spectrum Analysis, 1st ed. p. 296.

Philosophical Transactions (1859), vol. cxlix. p. 94.

Watts’ Dictionary of Chemistry, vol. ii. p. 393.

Philosophical Transactions (1859), vol. cxlix. p. 119, &c.

Baily’s Account of Flamsteed, pp. 378–380.

Herschel’s Astronomy, § 817, 4th. ed. p. 553.

Principia, bk. ii. Sect. 6. Prop. 31. Motte’s Translation, vol. ii. p. 107.

Ibid. bk. i. Law iii. Corollary 6. Motte’s Translation, vol. i. p. 33.

Thomson and Tait’s Natural Philosophy, vol. i. p. 333.

Philosophical Transactions, (1856), vol. cxlvi. pp. 330, 331.

First Annual Report of the Mint, p. 106.

Jevons, in Watts’ Dictionary of Chemistry, vol. i. p. 483.

British Association, Glasgow, 1856. Address of the President of the Mechanical Section.

Pelicotetics, or the Science of Quantity; an Elementary Treatise on Algebra, and its groundwork Arithmetic. By Archibald Sandeman, M. A. Cambridge (Deighton, Bell, and Co.), 1868, p. 304.